Locations:
Search IconSearch

Can the Glass Test Indicate Meningitis?

Pressing a glass on a rash provides some clues, but it’s not foolproof

Empty glass on blue table

The “glass test” claims to be an easy, at-home way for parents and caregivers to spot meningitis, a rare but potentially life-threatening condition. And as young children have a higher risk of this disease, it seems like a useful tool for parents to have in their arsenal.

Advertisement

Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy

What is the glass test? And is it reliable? Pediatrician Sabrina Ma, MD, has the answers every parent should hear.

What is the glass test?

The glass test is supposed to be a way to determine whether a rash could be from meningitis. To perform it, you press the side of a clear glass against the rash and watch how your skin responds. A meningitis rash is non-blanching, which means it won’t fade or disappear even when you press the glass on it.

Does the glass test work?

The glass test can alert you to a potential emergency, but it can’t diagnose or rule out meningitis on its own.

“The glass test can also be misleading,” clarifies Dr. Ma. “In the earlier stages of the illness, meningitis can cause a blanching rash, which temporarily fades when you press it. This means it could give you false reassurance.”

What does a meningitis rash look like?

“A meningitis rash isn’t a typical rash that results from irritated or inflamed skin,” explains Dr. Ma. “It won’t itch or feel rough or bumpy. The ‘rash’ you see is blood spots under the skin caused by leaking blood vessels.”

These spots, known as petechiae, usually look like small dots or blotches that are red, purplish or brown. Typically, the petechiae affect the arms, legs, hands and feet first.

In a matter of hours, the spots may grow into larger, bruise-like marks, known as purpura. Although these marks may look obvious on lighter skin tones, they can be hard to see on darker skin.

Advertisement

And the biggest problem with the glass test?

“If you wait until you see a non-blanching rash, it could be too late,” says Dr. Ma. “At this stage, the disease is more likely to cause severe illness and may even be fatal. Don’t wait for a non-blanching rash to appear before you seek medical attention.”

Knowing the signs is key

As the glass test isn’t a for-sure method for spotting meningitis, what else can you do?

“Learn the signs of the disease so you can watch for them in your child,” encourages Dr. Ma.

Meningitis symptoms in babies and children include:

Is my child at risk for meningitis?

Children can get meningitis from germs that enter the body and infect the meninges (coverings on the brain and spinal cord). These germs include bacteria, fungi or viruses.

Viral meningitis is the most common type in children,” shares Dr. Ma. “Fortunately, this type is usually less serious than bacterial meningitis, though any type requires immediate medical care.”

Any child can get meningitis, but children have a higher risk if they:

When to seek medical care

If your child has symptoms of meningitis or appears very ill, don’t make decisions based on the glass test. Head to the nearest emergency room.

And though illnesses like meningitis are a parent’s worst nightmare, try not to panic. “Meningitis is treatable when caught early,” reassures Dr. Ma. “With timely medical care, most children make a full recovery.”

Knowledge is power — and so are vaccines

Even though you can’t count on the glass test, you’re not powerless against meningitis. Knowing when to call your provider or seek emergency care is your first weapon against this disease.

Your other superpower? Vaccines.

The Haemophilus influenza type B (Hib) vaccine, given during infancy, protects against a bacterial infection that can cause meningitis. And many vaccines that prevent viruses also help protect your child.

“The flu, chickenpox and measles vaccines can greatly reduce your child’s risk of getting viral meningitis,” states Dr. Ma.

And finally, your parent’s intuition will help you determine whether your child needs medical care.

“Usually, meningitis will make your child feel very sick, very quickly,” Dr. Ma adds. “If something seems off, listen to your gut and contact your provider or get emergency care. It’s always better to play it safe and get it checked out.”

Advertisement

Advertisement

Learn more about our editorial process.

Related Articles

The six pillars of brain health, including get moving, get enough sleep and be social
April 25, 2025/Brain & Nervous System
6 Ways To Improve Your Brain Health

The ‘Six Pillars of Brain Health’ offers a game plan to maintain cognitive function

Woman wearing period panties for free-bleeding during menstrual cycle
April 24, 2025/Women's Health
Go With the Flow: What You Need To Know About Free Bleeding

If you wash regularly and change your underwear as needed, this can be a safe (and liberating) alternative to pads and tampons

Person leaning against wall, holding their head
April 24, 2025/Primary Care
Why Standing Up May Cause Head Pain

Dehydration, spinal fluid leaks and other conditions can cause positional headaches when you stand up

Shingles outbreak on shoulders
April 23, 2025/Infectious Disease
Recurrent Shingles: How It Happens and Who’s at Risk

If you have a weakened immune system, your risk for getting shingles a second or third time increases

Baby sitting on floor by crib, playing with blocks, with one in their mouth
April 23, 2025/Children's Health
Here’s Why Babies Put Everything in Their Mouths

Tiny taste-testing is a way babies can explore their world, relieve aching gums and self-soothe

Child in pool receiving a swimming lesson
April 22, 2025/Children's Health
Is There a Right Age for Kids To Learn How To Swim?

Swimming is an essential life skill — kids should start learning to swim by age 4

Baby with pacifier sitting in stroller, being strapped in
April 18, 2025/Children's Health
What Is ‘Container Baby Syndrome’?

Too much time in certain infant ‘containers’ can cause developmental delays and a flat spot on baby’s head

Vial of Tdap vaccine, with gauze pads
April 16, 2025/Infectious Disease
Time for a Tetanus Shot? When You Need One and Why

Tetanus is easy to prevent but tough to treat — vaccines are your best defense

Trending Topics

Person in bed sleeping on their side, covers off
Breathing Problems? Try These Sleep Positions

If you’re feeling short of breath, sleep can be tough — propping yourself up or sleeping on your side may help

A couple looking at skyline, with one person slightly behind the other, head bent down
What Is Anxious Attachment Style — and Do You Have It?

If you fear the unknown or find yourself needing reassurance often, you may identify with this attachment style

Glasses and bottle of yellow-colored prebiotic soda, with mint, lemon and ginger garnish
Are Prebiotic Sodas Good for You?

If you’re looking to boost your gut health, it’s better to get fiber from whole foods

Ad